The most common type of star in the Milky Way is called a red dwarf–these are smaller, cooler, and longer-lived than our sun. There are 160 BILLION of them in our galaxy and 40% of them have Earth-like planets orbiting them at the right distance for liquid water to exist on their surfaces, a condition that is necessary for life.
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The Pentagon is planning to build a spacecraft that can travel outside our solar system on a hundred-year trip, reporting on what it finds along the way. Why would a financially-strapped military pursue such a project–are they searching for hostile ETs?
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Our Milky Way galaxy is so big and so old–it contains at least 100 billion planets–so aliens should have visited us by now (Whitley Strieber thinks THEY HAVE!) This is what’s known as the Fermi Paradox.

In Discovery News, Ray Villard talks about science fiction writer Karl Schroeder, who has come upon a solution to the Paradox. He thinks that aliens have "gone green" and generate no waste products that we can detect. They therefore blend into the galaxy. Villard quotes him as saying that, in their case, "artificial and natural systems are indistinguishable." Villard theorizes that maybe only ecologically-balanced civilizations survive in the long run (that means WE won’t last long!)
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